Downloading games from the GOG store through cd keys is very easy and here we explain how to do it in a few simple steps!
1- First of all we have to go to the official website of gog, and log in or create a new account.
2- Once you are logged in, select "REDEEM CODE" in the menu of your profile or simply visit the following link https://www.gog.com/redeem
3- Enter the cd key you have purchased at any of the stores listed on Gocdkeys and press "continue".
And that's it!
It is also possible to activate codes through the GOG Galaxy application. To do this go to the settings wheel on the top left, select "Add Games & Friends" and then "Redeem GOG Code".